Die-starter.



J. J. Y0UNG.

DIE STARTER.

APPLICATION FILED APR. 27, 1910.

Patented 0G13. 29, 1912.

vwm/Lbofa Jij/@any lUlliFEED STATES PAIElNlT` OFFICE.`

JOI-IN J. YOUNG, OF'DENVER, COLORADO.

DIE-STARTER.

Specification of Letters Patent.

Application filed April 2'?, 1910.vr Serial No. 557,894.

To all whom it may concern:

Be it known that I, JOI-IN J. YOUNG, a citizen of the United States, residing at Denver, in the county of'Denver and State of Colorado, have invented certain new andV useful Improvements in Die-Starters; and l do declare the followingto bea full, clear, and exact description of the invention, such as will enable others skilled in thefartto which it appertains to make and use the Sil/H1B.

This invention relates to improvements in i die starters.

@ne object of the invention is to provide a device of this character whereby a die may be readily engaged with theend of `a pipe and started in the operation of cutting and particularly pointed out in the appended claims.

ln the accompanying drawings: Figure 1 is a vertical longitudinal section of a pipe showing the application of my improved starter and a die thereto; Fig. 2 is a cross sectional view of the same on the line 2-2 of Fig. 1; Fig. 3 is a longitudinal section of the starter removed from the pipe.

My improved die starter comprises a cylindrical body portion 1 the diameter of which corresponds substantially to the inside diameter of the pipe with which it is to be engaged. The outer body 1 is threaded as shown at 2 and said threaded outer portion has a diameter corresponding to the outside diameter of the pipe to which the starter is to be applied.- On the threaded outer end of the die is formed a reduced eX' tension 3 having arranged thereon a suitable handle 4. The body portion l is provided with a centrally disposed circular bore 5 the outer portion of which in the extension 3 is of less diameter than the main portion and said reduced portion is threaded to receive an expanding screw 6 having a conically shaped inner end 7. The outer end of the screw 6 is provided with a head S carrying a handle 9.

In the body portion 1- of` the starter is formed a series of'tra-nsveise radiallydisposed passagesl() of which there maybe anysuitablemumben andin said passages are slidably'mounted fastening pins 11 having pointed-outer ends 12 and beveled inner ends 13. The beveled inner ends 13 of thefpin project into the bore Eiland are adapted to expanding screw 6 wherebyfwhen the latter is screwed intoy the starter said pinsI will be .forced outwardly and the pointed outer ends thereof forcibly engaged 4with the inner surface of the pipe with which the starter is engagedthus securely holding the starter in position. `In each of the pins 11 is formed a notch or recess V14 said recess being adapted to receive stop pins 15 which are inserted through the side of the body portion 1 of the starter.y The pins 15 when thus engaged with the slots 14 limit the movement of the pins 11 and prevent thev same from dropping orbeing forced out of the passages l0.

In the oper-ation of the device the body portion of the starterfis inserted inthe end of the pipe and expanding lscrew 6 then turned in the proper direction to force the pins 11 into engagement with the inner. surface of thepipe thus securely fastening the starter -fn iplace. After the starter has thus been secured in the end of the pipe the threading die 16 which when in operative position is engaged with the enlarged threaded portion 2 of the body is turned by means of a stock or wrench in the `proper `been lcut ont-he endof the pipe the fastening pins 11 maybe released and thestarter screwed back out of the die by means of the handle 4.

By means of my improvedstarter the die may be joperatedto cut theb threads on a ,pipe by means of a wrench and withoutthe necessity of employing a stock which in Patented Oct. 29, 1912.

.,direction for screwingthe saine forwardly y many instances cannot be employed for turn ing the die thus necessitating the use of a 65 be engaged by the conicalfinner end of the Y i wrench or similar instrument. My improved starter will also be found useful in connection with the threading of large sized pipes or with pipes having broken or uneven ends wherein the starting of a die in the usual manner is ext-remely diiiicult.

From the foregoing description taken in connection with the accompanying drawings, the construction and operation of the invention will be readily understood without requiring a more extended explanation.

Various changes in the form, proportion and the minor details of construction may be resorted to without departing from the principle or sacrificing any of the advantages of the invention as defined in the appended claims.

Having thus described my invention, what I claim is:

1. In a die starter, a body portion having a part adapted to enter a pipe to be threaded, while one part of the body portion extends beyond said pipe and is threaded to receive a die, the threaded part of the body portion being of the same diameter as the pipe to be threaded, and means mounted on and carried by the body portion for locking the latter against turning in the pipe during the performance of the thread-starting function.

2. A plug having a portion adapted to enter a pipe and an enlarged threaded portion extending beyond the pipeentering portion, adapted to receive a die, the die holding port-ion being of the same diameter as the outside diameter of the pipe to be threaded, a stem threaded in the plug, and means carried by the plug and arranged to be actuated by the stem for locking the plug within the pipe. n

3. In a die starter, a body portion adapted to be engaged with the end of a pipe to be threaded, fastening pins arranged in said body portion, means to project said pins into operative engagement with the pipe t-o hold the starter in position thereon and a threaded die receiving portion formed on said starter whereby a die is fed into operative engagement with a pipe to cut the threads thereon.

4. In a die starter a body portion adapted to be engaged with a pipe to be threaded, fastening pins arranged in said body portion, an expanding screw adapted to force saidv pins outwardly and into engagement with the inner surface of the pipe whereby the starter is held in engagement therewith, means to limit the movement of said pins andan enlarged threaded die receiving portion whereby the die may be fed forward into operative engagement with the out-er surface of a pipe for the purpose of cutting threads thereon.

5. A thread-starter for pipe,

comprising a plug adapted to extend int-o the end of said pipe, a threaded stem arranged to be screwed in and out of said plug a short distance, cam dogs mounted on the end of said plug that extends into the pipe, and arranged to be actuated by said stem to cause said dogs to engage and to grip the inner surface of said pipe, a threaded collar portion on the outer end of said plug of substantially the same diameter as the outside diameter end of said pipe, and arranged to bear against the end of said pipe and arranged to receive a die adapted to cut a thread on said pipe.

6. A thread-starter for starting threads on pipes, comprising a plug adapted to extend into a pipe, a threaded collar portion adapted to bear against the end of the plug and provided with a thread of the same size andpitch as the thread that is to be cut on the end of the pipe, and adapted to receive the thread-cutting die that is adapted to lcut the thread on the pipe, with a stem extending through said plug and threaded to it, cam dogs mounted in said plug and arranged to be actuated by said stem to engage and grip the inner surface of said pipe, and a hand-wheel secured to the outer end of said stem and arranged to rotate said stem to actuate said cam dogs to grip the inner surface of said pipe when the stem travels in one direction, the cam dogs being arranged to be released when the stem travels in the opposite direction.

7. In a thread-starter for pipe, the combination of a plug provided with a thread arranged to receive a threadcutting die so that said thread-cutting die can be screwed from said plugs thread on to said pipe in such a manner as to start a thread thereon, and means including cam dogs and a threaded rod mounted on said plug, the threaded rod being arranged to actuate the dogs, for securing said plug to said pipe.

8. A plug having a portion adapted to enter a pipe and an enlarged threaded portion extending beyond the pipe-enteri ng portion and adapted to receive a die,-the dieholding portion being of the same diameter as the outside diameter of the pipe to be threaded, and means carried by the plug for locking the latter within the pipe.

9. A plug having a portion adapted to enter a pipe and an enlarged threaded portion extending beyond the pipe-entering portion and adapted to receive a die, the dieholding portion being of the same diameter as the outside diameter of the pipe to be threaded, and means carried by said plug for holding the latter against turning within the pipe during the performance of the thread-starting function.

10. A plug having a portion adapted to enter a pipe and an enlarged threaded port-ion extending beyond the pipe-entering portion, the enlarged portion being adapted to receive a die, the de-holding portion bemy hand in presence of two subscribing Witiing of thef slame diameter as ih outside nesses.

ciameter o t e pipe to e threa e a stem carried by the plug and means actuated by JOHN J' YOUNG' the stem for looking the plug Within the Witnesses:

pipe. H. W. PURCELL,

In testimony whereof I have hereunto set L. I-I. BooK.

Copies of this patent may be obtainedv for ve cents each,l by addressing the Commissioner of Patents,y Washington, D. C. 

